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Injector mounting arrangement

a technology for injectors and mounting brackets, which is applied in the direction of machines/engines, fuel injection apparatuses, and feed systems, etc., can solve the problems of greater mechanical force required of actuators and undesirable noise generation of engine structures

Inactive Publication Date: 2010-06-15
DELPHI INT OPERATIONS LUXEMBOURG S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Significantly reduces noise transmission to the engine structure by targeting vibration nodes and using decoupling materials, enhancing the quiet operation of engines with piezoelectric or electromagnetic fuel injectors.

Problems solved by technology

However, one problem with using a direct acting piezoelectric actuator is that a greater mechanical force is required from the actuator in order to move the valve needle.
Such high forces, and the associated high rates for force switching, are transmitted through the injector to the associated engine and result in an undesirable level of noise generation from the engine structure.

Method used

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Examples

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Embodiment Construction

[0042]Referring to FIG. 1, a known injector mounting arrangement is shown which includes an engine housing part in the form of an engine cylinder head 10 which defines a cylinder volume, or engine combustion space 12. The arrangement is provided with a plurality of fuel injectors 14, each of which is mounted within a respective opening or bore 16 provided in a respective cylinder head 10. Only one of the injectors is shown in FIG. 1 and only one will be described in detail as all of the injectors are substantially identical. One or more outlets (not shown) of the injector 14 projects into the cylinder volume 12 so as to permit injection of fuel for combustion.

[0043]The injector 14 typically takes the form of the piezoelectrically operable type including a piezoelectric actuator which is coupled, by means of a motion amplifier, to a fuel injector valve needle. The valve needle is moveable under the control of the actuator towards and away from a valve needle seat so as to control the...

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Abstract

An injector mounting arrangement for use in an engine, the injector mounting arrangement including: a fuel injector having one or more resonant modes of vibration, an engine cylinder housing, and a clamping arrangement including a clamping member for applying a clamping load to the injector so as to clamp the injector to the cylinder housing wherein the clamping load is applied at or substantially at a vibration node of one of the one or more modes of vibration of the fuel injector so as to damp or substantially prevent transmission of injector generated noise to the cylinder housing.

Description

TECHNICAL FIELD[0001]The present invention relates to an injector mounting arrangement comprising at least one fuel injector for delivering fuel to an associated engine cylinder or combustion space. In particular, but not exclusively, the invention relates to an injector mounting arrangement for a common rail engine including a plurality of piezoelectrically operable fuel injectors.BACKGROUND TO THE INVENTION[0002]In known common rail fuel systems, a high pressure fuel pump is arranged to charge an accumulator volume in the form of a common rail with fuel at high pressure for delivery to a plurality of associated injectors. Each injector includes a valve needle which is movable by means of an actuator, towards and away from a valve seat, to control fuel injection through a plurality of injector outlets.[0003]It is known to control valve needle movement by means of an electromagnetic actuator including a solenoid winding through which a current is passed to activate an armature. In t...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F02M61/14
CPCF02M61/14F02M2200/16
Inventor HARDY, MARTIN P.
Owner DELPHI INT OPERATIONS LUXEMBOURG S A R L